EP 1294195 A1 20030319 - A process for the format conversion of MPEG bitstreams, a system and computer program product therefor
Title (en)
A process for the format conversion of MPEG bitstreams, a system and computer program product therefor
Title (de)
Verfahren zur Datenformatumwandlung eines MPEG kodierten Bitstroms, System und Programmprodukt dafür
Title (fr)
Procédé pour la conversion de format de données MPEG, système et programme informatique associés
Publication
Application
Priority
EP 01830589 A 20010914
Abstract (en)
The DCT macroblocks (MB) comprised in an MPEG video bitstream are divided into blocks (B1, B2, B3, B4), each of which comprises a plurality of microblocks. In each DCT block (B1, B2, B3, B4), the significant frequencies are identified and preserved, isolating a corresponding microblock (mB1, mB2, mB3, mB4) preferably consisting of the microblock on the top left of each block (B1, B2, B3, B4) and setting to zero the coefficients of the remaining microblocks. On the microblock thus isolated there is performed an inverse discrete cosine transform (16), and the microblock thus obtained is merged (18) with the homologous microblocks obtained from the other blocks comprised in a respective starting macroblock (MB), so as to give rise to a merging block. The merging block thus obtained undergoes a discrete cosine transform (20) so as to obtain a final block, which can be assembled into a macroblock (MBD) with converted format. <IMAGE>
IPC 1-7
IPC 8 full level
H04N 7/30 (2006.01); G06T 9/00 (2006.01); H03M 7/30 (2006.01); H04N 7/26 (2006.01); H04N 7/46 (2006.01)
CPC (source: EP US)
H04N 19/40 (2014.11 - EP US); H04N 19/59 (2014.11 - EP US)
Citation (search report)
- [A] WO 0051357 A1 20000831 - SARNOFF CORP [US]
- [A] WO 0000907 A1 20000106 - ERICSSON TELEFON AB L M [SE], et al
- [X] DUGAD R ET AL: "A fast scheme for image size change in the compressed domain", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, APRIL 2001, IEEE, USA, vol. 11, no. 4, pages 461 - 474, XP002192206, ISSN: 1051-8215
- [X] MERHAV N ET AL: "FAST ALGORITHMS FOR DCT-DOMAIN IMAGE DOWN-SAMPLING AND FOR INVERSE MOTION COMPENSATION", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, IEEE INC. NEW YORK, US, vol. 7, no. 3, 1 June 1997 (1997-06-01), pages 468 - 476, XP000690585, ISSN: 1051-8215
- [A] KIM D ET AL: "TRANSCODING DV INTO MPEG-2 IN THE DCT DOMAIN", PROCEEDINGS OF THE SPIE, SPIE, BELLINGHAM, VA, US, vol. 3653, no. 1/2, 1998, pages 1026 - 1032, XP000870210
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1294195 A1 20030319; JP 2003163932 A 20030606; US 2003090591 A1 20030515; US 7369613 B2 20080506
DOCDB simple family (application)
EP 01830589 A 20010914; JP 2002261167 A 20020906; US 24308102 A 20020912